promptfoo

license

MIT(OSI)

source

public(GitHub)

core-gated

ungated

MIT-licensed and fully public, and MIT is an OSI license, so this is open source. OpenAI now owns the project, which does not change the license the code ships under.

• https://github.com/promptfoo/promptfoo recorded 2026-06-04

  MIT license; 'remains open source and MIT licensed' under OpenAI; v0.121.14

• https://api.github.com/repos/promptfoo/promptfoo/license recorded 2026-08-13

  GitHub's license endpoint reports spdx_id MIT for promptfoo/promptfoo and returns the MIT text as the LICENSE body.

• https://raw.githubusercontent.com/promptfoo/promptfoo/main/README.md recorded 2026-08-13

  README states 'Promptfoo is now part of OpenAI. Promptfoo remains open source and MIT licensed' and lists 'Open source - MIT licensed, with an active community' among its properties. The CLI installs and runs from npm with no account, and nothing in the README offers a paid tier, an enterprise edition or a license key.